Fuel Cell Separator Plate Layout for Freeze-Tolerant Low Pressure Loss
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Solution Overview
Problem
Fuel cell stacks are prone to blockages due to frozen water and exhibit high pressure loss, requiring careful installation positioning and increasing the risk of operational issues, especially in vehicle applications where freeze starts are common.
Innovation Solution
The separator plate design features a distribution region that surrounds the through-opening around its entire perimeter, reducing pressure losses and allowing gas flow from all directions, eliminating the need for a specific installation position and enhancing flow distribution even under freezing conditions, with support structures like fins or nubs and an optional intermediate layer for sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If through-openings are connected to distribution regions via supply channels or vias, then the structure provides defined flow paths, but pressure losses increase and flow cross-section is reduced
Solution Approach 1:
The patent merges the through-opening and distribution region by designing the distribution region to surround the through-opening around its entire perimeter, eliminating the need for separate supply channels or vias. This integration creates a larger effective flow cross-section and reduces pressure losses by allowing direct gas access from all directions around the through-opening.
Solution Approach 2:
The invention transitions from a one-dimensional linear connection (via supply channels) to a two-dimensional surrounding structure where the distribution region encircles the through-opening. This dimensional change provides multi-directional flow access and significantly increases the effective flow area, reducing pressure losses.
2Reliability
If through-openings are connected via supply channels or vias, then the structure provides defined flow paths, but the installation position becomes critical due to freeze blockage risk
Solution Approach 1:
The patent applies local quality by surrounding the through-opening with a distribution region that provides multiple local flow access points around its entire perimeter. This ensures that if one area becomes blocked by ice, other areas remain open for gas flow, making the system reliable under freezing conditions without requiring specific installation positioning.
Solution Approach 2:
The invention provides beforehand cushioning against freeze blockage by creating redundant flow paths around the entire perimeter of the through-opening. This preparatory design ensures that even if freezing occurs in certain areas, the system maintains operational capability through alternative flow routes, eliminating the need for careful installation positioning.
3Stability of the object's composition
If separator plates have complex channel structures for media distribution, then uniform media distribution is achieved, but pressure loss increases
Solution Approach 1:
The patent combines the distribution function directly at the through-opening by surrounding it with a distribution region, eliminating the need for complex intermediate channel structures. This merging achieves uniform media distribution while reducing pressure losses by providing a large, direct flow area.
Solution Approach 2:
The invention changes the flow path parameters by transitioning from narrow, winding channels to a large, open distribution region surrounding the through-opening. This parameter change increases the flow cross-section and reduces flow resistance, achieving both uniform distribution and lower pressure losses.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces pressure losses, allows for flexible installation, and ensures reliable operation under freezing conditions, enabling a compact, lightweight fuel cell system with improved flow distribution and reduced risk of blockages.
Implementation Method 1
a correspondingly larger flow cross-section is now available to optimize the transfer of gases from the area of the through-opening into the distribution region
Data Source
AI summary
A separator plate (1) for media guiding in a fuel cell, with at least one through-opening (2, 3, 4, 5, 6, 7) for supplying and at least one through-opening (2, 3, 4, 5, 6, 7) for discharging a medium, with a channel structure (12) for uniformly guiding the medium, as well as with distribution regions (9) which connect the through-openings (2, 3, 4, 5, 6, 7) with the channel structure (12). At least one of the distribution regions (9) surrounds at least one of the through-openings (2, 3, 4, 5, 6, 7) associated with it around the entire perimeter.